AZDENT New Pro Sonic Electric Toothbrush Rechargeable USB Replaceable Head Introduction: Product Name: AZDENT Sonic Electric Toothbrush Model Number: AZ-1Pro Waterproof: IPX7 Decibel: less than 50 db, very quiet Vibration Frequency: 28000-31000 times/min Power supply: USB charger Charging time: 4-6 hours Feature: 2 minutes smart timer 30 seconds pausing reminder 3 Speed Adjustment Mode( Clean, Soft, White) Package contents: 1 Electric toothbrush handle 4 replacement heads 1 USB charger Clean mode 31000 times/min ultra-high frequency vibration, quickly clean the impurities of the mouth. Soft mode Effective cleaning at the same time play a nursing role for the gum-sensitive users. Notice: ( Charging time: 4-6 hours) When charging please keep the electric toothbrush in the boot state, the power of the USB charging head also need turning on. when charging the red light will shining, when charging full the red line will long bright. Please contact us if you have any question, we will be happy to help!